TECHNICAL INFORMATION
1. TECHNICAL INFORMATION
1.1 GENERAL EXPLANATIONS
1.2 COMPONENTS OF RA 300 E / RA 400 E / RA 650 E
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9
4
Power Switch (Changeover Switch)
Mains LED
HOT START Current Knob
Handles
V/A Digital Meter
Rutile/Basic/Cellulosic Selection Switch
Welding And Earth Cable Outlets
Current Adjustment Knob
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6
10
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12
Lifting Eyes
Thermal
L
Protection ED
ARC FORCE Adjustment Knob
Welding Carbon Gouging Selection Switch
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Figure 1:
ine
Components of the Mach
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RA 650 E
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RA300E, RA400E and RA650E are t yristor (SCR) controlled welding machines, designed to weld all type of
coated electrodes from 2mm, 300 model up to 5 mm, 400 & 650 models up to 6mm, while 400 model can
carbon gauge up to 6mm, 650 model can carbon gauge up to 10mm. For RA650E, cellulosic welding at low
currents is not recommended. Since 300 & 400 models can go as low as 20 Amps, their cellulosic welding
behavior is excellent and if a proper TIG starting unit is connected, they can perform as a DC TIG welder as
well. These units can be grouped as 4, 6, 8 or 9 machines in a rack, for large construction sites like shipbuilding
etc.
Due to th ristor (SCR) and electronic close loop control technology, current is adjusted precisely by a
potentiometer, initial striking ability of the electrodes can be improved via Hot Start potentiometer and certain
electrodes like basic electrodes which have tendency to short circuit and stick to the weld pool could be
avoided by adjusting the Arc Force potentiometer. Also due to this technology, pre-adjusted current stays
stable even during mains fluctuations or if additional welding cables are used. Electrical efficiency of these
machines are 70%.
Even though there is a certain level of electronics is involved in this machine, the PCB is protected in a
separate cabinet inside of the machine against dust and corrosion. With its telescopic arms and big wheels it
can be pulled easily across the working area especially at outdoor welding sites. Also stepless remote current
controlling is possible as an option.
These machines are fan cooled and thermally protected against overheating and phase failures.
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y
RA 300 E / RA 400 E / RA 650 E
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